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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Deterministically encoding quantum information using 100-photon Schrödinger cat states.

Brian Vlastakis¹, Gerhard Kirchmair, Zaki Leghtas

¹Department of Physics and Department of Applied Physics, Yale University, New Haven, CT 06511, USA.

Science (New York, N.Y.)

|September 28, 2013

Summary

Researchers demonstrate multiphoton control using superconducting qubits and cavity resonators to create large quantum "cat states." This advances quantum computation and metrology by manipulating hundreds of photons simultaneously.

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Area of Science:

Quantum Computing
Quantum Optics
Superconducting Circuits

Background:

Single quantum bits (qubits) have limitations in storing information compared to oscillators.
Oscillators can store multiple excitations and coherences, enabling complex multiphoton states.

Purpose of the Study:

To demonstrate precise multiphoton control using superconducting qubits coupled to a cavity resonator.
To create and manipulate large-scale quantum superposition states, specifically "cat states."

Main Methods:

Utilized a superconducting transmon qubit with a highly ideal off-resonant coupling to a waveguide cavity resonator.
Employed conditional qubit-photon logic for state manipulation.
Leveraged dispersive interaction significantly exceeding decoherence rates.

Main Results:

Achieved simultaneous manipulation of hundreds of photons.
Successfully mapped arbitrary qubit states to "cat states" with up to 111 photons.
Extended the protocol to generate superpositions of up to four coherent states.

Conclusions:

Demonstrated a powerful interface between discrete and continuous variable quantum computation.
The developed control enables creation of large cat states, advancing quantum information processing.
Potential applications in quantum metrology and information processing are highlighted.